Frank george hughes



(No Model.)

F. G. HUGHES.

FASTENING FOR DENTAL FLASKS. No. 367,401. Patented Aug. 2, 1887.

UNITE STATES PATENT OFFICE.

FRANK GEORGE HUGHES, OF GALT, ONTARIO, CANADA.

FASTENING FOR DENTAL F LASKS.

SPECIFICATION forming part of Letters Patent No. 367,401, dated August2, 1887.

Application filed February 14,1887. Serial No. 227,489.

To all whom it may concern.-

Be it known that I, FRANK GEORGE Huerrns, a citizen of the Dominion ofCanada, residing at Galt, in the county of Waterloo, in the Province ofOntario, Canada, have invented a new and useful Fastening for Dent-a1Flasks, of which the following is a specification.

My invention relates to improvements in fastenings for dental flaskswhich are used for casting rubber palates; and the object of myinvention is to provide means whereby the covers of the flasks maybe'secured in place in a more expeditious manner than by the use ofscrews and nuts, by which these flasks are now held together. I attainthis object by the device illustrated in the accompanying drawings, inwhich--' Figure 1 is a perspective view of a flask provided with myimproved fastenings. Fig. 2 is a plan view of the lower box, and Fig. 3a similar view of the upper box. Fig. 4 is an under side View of thecover, and Fig. 5 is a sectional elevation of the flask complete. Fig. 6is a separate view of one of the clamps.

Similar letters refer to si milarparts through out the several views.

The lower box, A, has secured to it several pairs of the lugs a, andnear to two or more of these pairs of lugs are the lugs b, for thepurpose hereinafter stated.

The upper. box, B, is provided with the steadying-pins c, which projectbelow its lower edge.

In placing the upper and lower box together when they contain a plastermold, it is necessary that no lateral motion which would injure the moldshould occur. This is guarded against by the pins 0, which, passingbetween the lugs a and the lugs 1), guide the upper box directlyinto itsplace. The several parts .of the flask are held together by the clampsC, Fig. 6, which are provided each with a-hook, d, and slot f at one endand with lateral arms or shoulders e e at the opposite end. Theflask-cover D is provided with the lugs g, corresponding with the lugs aon the lower box,

but with the addition of the upward-turned limbs h. When the flask hasbeen placed together preparatory to casting, the clamps G are placedbetween the lugs a with their shoulders 6' close against the undersidesof (No model.) Patented in Canada March 26, 1887, No. 26,325.

the lugs. They also pass between the lugs g on the cover, and have theirhooks d overhanging the cover. On the cover D are also fixed the dowelsa which take into the holes I) in the box B, as shown in Fig. 3, andthereby hold the cover in place before the clamps are applied.

The several parts of the flask are tightened together by driving thekeys E through the slotf and over the lugs g of the cover,.which is amuch quicker way of securing the flask together than by the present modeof turning nuts down upon screws.

While the palate'is being heated the hooks d, engaging the sockets z",will be found to hold the parts sufflcientl y for all practicalpurposes; but when placed in the press the parts of the flask must besteadied, and it will be necessary to employ the keys.

Having now fully described my invention, what I desire to claim andsecure by Letters Patent is- 1. In combination with box B, a box, A,provided with lugs a a, arranged in pairs and separated a distance fromeach other, cover D, provided with lugs g 97, also arranged in pairs,clamps 0, provided with lateral arms or shoulders e e at one end andhook d and slot fat the other end, and wedges E, adapted, substantiallyas shown, to pass through the slotf and bear upon the lugs g.

2. The combination, in a dental flask,of the lower box, A, provided withthe lugs aand b, the upper box, B, having the pins 0 and holes 12 andthecover D, having notches i, lugs g,

and dowels r, with the clamps C, having the hook, d, shoulders c, andslot f, and the keys E, substantially as and for the purposes set forthand described.

3. In combination with box B, box A, having lugsa a, arranged in pairs,cover D, having lugs g 9', also arranged in pairs above the lugs a a,and provided with upwardly-turned ends h h, clamps 0, provided withlateral arms ee, slotf, and hook cl, and wedges E, all combinedsubstantially as shown, and for the purposes described.

FRANK GEORGE HUGHES.

.Vitncsses:

ROBERT D. KAY, J OHN KAY.

